FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Montezuma Castle National Monument, Arizona, USA. This castle ruin was built in limestone cliffs by the Sinagua Indians around 1400 AD. It is 5 stories high and contains 20 rooms. It is the last known settlement of the Sinagua people. The area was declared a US national monument in 1906.
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